Abstract
An environment-friendly technique for depositing a Mg–Al hydrotalcite (HT) (Mg6Al2(OH)[Formula: see text]-CO[Formula: see text]H2O) conversion film was developed to protect the Mg–Gd–Zn alloy from corrosion. The morphology and chemical compositions of the film were analyzed by scanning electronic microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy (RS), respectively. The electrochemical test and hydrogen evolution test were employed to evaluate the biocorrosion behavior of Mg–Gd–Zn alloy coated with the Mg–Al HT film in the simulated body fluid (SBF). It was found that the formation of Mg–Al HT film was a transition from amorphous precursor to a crystalline HT structure. The HT film can effectively improve the corrosion resistance of magnesium alloy. It indicates that the process provides a promising approach to modify Mg–Gd–Zn alloy.
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